Bugzilla

Bugzilla

http://www.bugzilla.org/
Bugzilla is the leading open-source/free software bug tracking system. It features a comprehensive set of fields, attachment management, inter-bug dependencies, email notification of changes, a powerful query interface, reporting, and Web, XML, email, and console interfaces. It can be managed entirely using a Web-based UI. The user UI is customizable using templates.

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